Latvia, Scott B21-B23 on 1926 Air Mail Cover to Uruguay. 4 strikes of RIGA 5 / 3.VI,26 / LATVIA CDS tie complete set of pairs & Latvian Air Mail etiquette to colorful cover with additional Air Mail "1918-1928 Riga - Luzerne" cinderella. Reverse: purple flight handstamp, F-VF.